Johnson Controls A19ZBC-6 Thermostat

The Johnson Controls A19ZBC-6 Thermostat is a heavy-duty single-stage temperature control designed for demanding commercial and industrial HVACR applications. Engineered with a Single-Pole Double-Throw (SPDT) switch, this utility thermostat provides reliable automatic reset functionality for both heating and cooling equipment. The unit features a versatile 0 to 70 degree Fahrenheit temperature range with a highly adjustable 12 to 40 degree differential, allowing technicians to fine-tune the cut-in and cut-out points to prevent short-cycling and ensure precise system operation. Utilizing a remote bulb sensing element and a 5-foot capillary length, this control is ideal for refrigeration display cases, walk-in coolers, and hot water immersion applications when used with an appropriate bulb well. Compatible with 120/208/240 Vac line voltage, the A19ZBC-6 provides the rugged durability and liquid-filled sensing accuracy required for severe environments where dependable temperature monitoring is non-negotiable.

• Dual-Purpose SPDT Switching: High-capacity contacts allow for seamless integration into either heating or cooling circuits, providing flexible field application.
• Broad Differential Range: The adjustable 12°F to 40°F differential settings provide superior control over equipment cycling, extending the life of compressors and fans.
• Remote Sensing Precision: The 5' capillary and 3/8" x 5" bulb allow for accurate temperature detection away from the controller body, ideal for localized sensing in tanks or ducts.
• Industrial-Grade Construction: Features a moisture-resistant enclosure and automatic reset logic to maintain consistent operating parameters without manual intervention.

Can the A19ZBC-6 be used for hot water immersion?
Yes, this model is frequently used for hot water control. For direct immersion, it is recommended to use a compatible bulb well or packing nut assembly to protect the remote bulb sensing element and ensure a leak-proof seal.

Is this thermostat compatible with 277V systems?
The standard Johnson Controls A19ZBC-6 is rated for 120, 208, and 240 Vac. Always verify the specific electrical ratings on the nameplate and use copper conductors only to match your local electrical code requirements.

How do I adjust the temperature differential?
The differential is adjusted via an internal scale plate. By moving the adjusting lever, you can set the spread between the cut-in and cut-out temperatures within the 12°F to 40°F range for optimized system performance.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.